HFU HF Underground

Loggings => 10/11 meters => Topic started by: Looking-Glass on January 24, 2016, 0516 UTC

Title: Clandestine 27MHz CW beacons...
Post by: Looking-Glass on January 24, 2016, 0516 UTC
"5ABH"  27.878MHz  CW  Transmits "5ABH" three times, then tail, then keys off for four minutes, hence sequence, been around for over 2 to 3 years. Last heard 23rd January 2016 539 report 0410z.

"IR2"     27.003MHz  CW  Transmits "IR2" three times, then tail, then keys off for four minutes, hence sequence, been around for over two to three years.  Last heard 23rd January 2016 569 report 0345z.

"4IBH"   27.385MHz  CW  Not personally heard by me but reported by others in Australia coming from Asia, some format as 5ABH & IR2, so probably some group.

Some radio friends in Asia say the beam heading suggests China, not in Japan nor Philippines.  Could be university propagation beacon?  Military beacon?  Possibly from Asiatic Russia?  Not coming from Pacific region or North/South America, only heard during daylight hours on 11m when band open to Asia.

Google and other net searches has given me a zero result, someone must know these mystery beacons?  Jack, Mount Piddington NSW (Yaesu FT-1000D, multi vertical & 240 random wire)
Title: Re: Clandestine 27MHz CW beacons...
Post by: R4002 on January 25, 2016, 1200 UTC
Likely fishing drift buoy transmitter beacons.  Usually found in the 1.6 to 2.2 and 26 to 30 MHz ranges.  Another (less likely) possibility is that they are "channel markers" or propagation beacons used to indicate band openings to certain locations and/or hold a frequency to prevent others from using it.  27385 is one of the busier 11m frequencies though - which means its likely drift net buoy transmitters that you're hearing.  The IDs could be anything from a shorting of the ship's name or callsign to a randomly selected group of characters (see the replies to the other thread you made about this in the beacons subforum).